
Gas Engineering
Authored by Eugene Schutte
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Professional Development

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8 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When natural gas escapes from gas pipework into a room its relative density will tend to make it:
Fall, potentially causing greater concentrations at low level.
Rise, potentially causing greater concentrations at high level.
Prevent it from readily diffusing into the air, causing collection at the source of the escape.
Split into its component elements producing concentrations of different gases throughout the room.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The flammability limits for natural gas (methane) are approximately:
2 to 10% gas in air.
5 to 15% gas in air.
10 to 20% gas in air.
15 to 50% gas in air.
3.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Yellow flames seen in the radiant area of a conventional gas fire may indicate signs of:
Lack of use.
Flame reversal.
The flue spigot restrictor not being fitted.
Insufficient primary air to allow complete combustion.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A flame impinging on the walls of the combustion chamber or the surface of the heat exchanger in a gas boiler may cause:
Vitiation causing increased combustion efficiency.
Flame vortexing and therefore complete combustion.
Incomplete combustion causing soot deposits to block the flueways.
Catalytic combustion and therefore higher flame and flue gas temperature.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A blockage in the flue of a room sealed boiler is likely to result in:
Complete combustion caused by vitiation.
Incomplete combustion caused by vitiation.
Complete combustion caused by reduced airflow over the burner.
Incomplete combustion caused by excessive air passing over the burner.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary cause of carbon monoxide production in a gas boiler?
Incomplete combustion due to insufficient oxygen.
High humidity levels in the combustion chamber.
Excessive air supply to the burner.
Complete combustion of natural gas.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a potential consequence of a gas leak in a confined space?
Increased oxygen levels leading to better combustion.
Immediate dissipation of gas into the atmosphere.
Formation of water vapor reducing humidity.
Accumulation of gas leading to an explosion risk.
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